package day20171128;

public class StringBufferExample3 {
    public static void main(String[] args) {
        StringBuffer s1=new StringBuffer("AB");
        StringBuffer s2=new StringBuffer("CD");
        operate(s1,s2);
        System.out.println("s1="+s1+" s2="+s2);
    }
    static void operate(StringBuffer x,StringBuffer y){
        x.append(y);
        x=y;
    }
}
